An excitatory postsynaptic potential
a. is only one of several types of graded
potential.
b. has a hyperpolarizing effect.
c. will drive the membrane away from its
potential.
d. is summed with an inhibitory postsynaptic
potential at the input zone of a neuron in a
process known as synaptic integration.
e. is none of these.
D
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The region of soil in the immediate vicinity of the roots of plants is called the ________.
A. phyllosphere B. plant crust C. rhizosphere D. microbivory
The cylinders in this experiment represent a 24-hour period. The light area represents light periods during a 24-hr. period and the dark area represents dark periods during a 24-hr. period. The critical length of dark vs. light periods for flowering is depicted by the dotted line. Note that some plants are flowering and some are not flowering. Study the results of this experiment on photoperiodism and flowering to determine whether the following statements are true or false.Long-day plants will never flower if the day length is shorter than the critical period.
Answer the following statement true (T) or false (F)
The immediate results of the widespread use of pesticides and fertilizers included ________, but long-term results included ________
A) dramatic increases in crop yields; the evolution of pest resistance B) the increased spread of malaria; delayed resistance to pesticides C) global declines in agricultural productivity; worldwide distribution of DDT D) global declines in undesirable pests such as mice and rats; increases in these pests
Which two enzymes catalyze the steps converting the toxic superoxide ion to less harmful oxygen gas?
A) Catalase and oxidase B) Superoxide dismutase and hydrogen peroxidase C) Catalase and hydrogen peroxidases D) Superoxide dismutase and oxidase E) Superoxide dismutase and catalase